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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c302c026afc448c88273aadd1705fd5688b4957839e8322454e49b7e728470b4' 
  AND token = 'qvYeizlxy/1T/KVR697nd5xm3PdzC5cZN+mEXVZTiGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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