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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc9edc6a12cfccc7604cd9e5bd6521010c8c564ec57a0bc0f9bcc2fd989e23c' 
  AND token = 'EuFfjuYa03CaYeA/gvLopz93sFF7IGZEL6N9oQ9M5kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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