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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d25a83bd3c73411ae50d0ea1ee1f4f5fa14f27ac85e66a35861425f815c7a86' 
  AND token = 'fXGwlDR59uHJUiXAG1KU7hSCluk23Cva5wmPjDYAVhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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