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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2371b2262a0c9c78a33d7c86f419bc91d0b987e2737777e159c170d2b0db263a' 
  AND token = 'Cf/QtjZS6Cj6l9BJE+Y2nzn3PfBnnFDDsLk49Mo5ByQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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