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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46990f8cc16999b77ab99a263a8e89a132f9ea46919083eaba1a306028734f8' 
  AND token = 'XWZP29KaI7dKYNCom/0bo4l5Q8dGud3T5s4Pr6c795U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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