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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e33d71e5d5a3f4f1a28b2c3bfbe78c9ac87414c677eacb0b763cf7f1d61b91' 
  AND token = 'mH9kvabw/GDmC7TIa0wA1VJUdopoXn2tBqFj/iE/+yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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