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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e19dafc2164abcac5886cc901f8edb6e35a560678ce102d5e6b0f82881b3b8b' 
  AND token = 'A0RRlT+OSJ3zfPnGE63qcZVkt+QSaA0Gx823CEnSh68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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