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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fdd19fa6d6d1632159f5d74a5c45953674b9c1751d3c38e14741d7e5a2b804' 
  AND token = 'wmKyZ1CAFjqD2t/W4UjIptwSN+kG6QPc49Nm0uftico=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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