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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb2c3b4ef59f762eaee9cc3feed5a33907c58dae264d4d4f41743c3828bc87a' 
  AND token = 'xR9A2L2oKik0+byFM8swE4M30+Pz0aTCjEFt9ZLZT78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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