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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e8ab6e574cb2eef321d9b2dd3ecaef313f272e9b860978fbd12c511f6dea51' 
  AND token = 'nCuBU8lIlEyfuGfMWaJZgoOhWre4IrYrWv58gYf/cZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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