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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43032e2692a77f7a1cb161d86e6c2d95a8d486d4a0b6f4f3f72ec86bdb7eb332' 
  AND token = 'e7wB6rDdIPLJlegr+TQjIwNKNGx5/P6o7saTtXM6ebw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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