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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd8cdef9d51f444d47168c8223113b60a4b3019b8ef51d03145c8127d34d7cd' 
  AND token = 'uVhawrTlZiAUJdzqTBaY1xRx01gInyytBvH2PlryKkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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