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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c1ce8b5c92738cad1bd78df447b277250e8976ab19376e1b0f44befc7b43ca' 
  AND token = 'AY61xTeQ1PrIk5cMWttbYEdNrDJxwoxYca3zWAFGizc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}