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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a83557c58fcd98293348784cb635017cc50abbd72d4beb47ac27b67466c9518' 
  AND token = 'NWov0yRex75sYdhmfvSXAyTB53U0PF+osicRp7iKVQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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