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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee2f4e75758a36507210a811eb3baec79a829021c3d5c7ceab96b4d3c67944e' 
  AND token = '692srQk40dXqjHJhAxxzqubc0T/Sc+vOfLWIATrr63Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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