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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330418cb6d3c2c336d8d9abb0b98e25657a0a79c2bba0d34bf22afd7a35e6a8f' 
  AND token = 'L8ghZ44ULa4NKCCma2fRYFX7+Sg9euid0tzXhGd6q5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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