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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d6a36573527fd4056f0b66fc97a126fbc60f3f25c435fde1a73fa36642921c' 
  AND token = '+ccj7RgqyRZVOCRDY792m57hvBI6rJiT4qEhZCSjigk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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