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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f7eca8844b2f80aca24ebe98f919c00aaeadfc6de39f7137b533908349f2b8' 
  AND token = 'kxCjYtKMxR8cpkYqnF2AK9l2zr/EWC9Nmncti4zaOqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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