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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fc3f79931abd152e3076ba3711e7abf514573e56368376ac06ffcbd9eb19a6' 
  AND token = 'M1BE4MeNEz2gkPiPBH5mREi63WhEe55vQX8nk6oP0m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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