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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c1c10484b08054180817721399defa60f232e7cf4e755ef7a27093fb319576' 
  AND token = 'bIb6+v9vIseegftI8YkgfbsElpvpYSAeZaNRzoYlTaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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