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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e873a3590cf11f6e25bcd87b173a1d8e54e0ee5dbeb881eebad3edacc8d9870e' 
  AND token = 'ZaikV6RaxkLFSjcm34UXtccBAzWE0+HClf2kbBngC3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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