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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa4c33f717e6f954463e2a6a6f841b9ef9b0040a494caa61df6840a5bea69ff' 
  AND token = 'cyVYr8tdOsaYXhC/Gx1+o/0bI2HjafMi0Gdnjjd7oHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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