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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52435e71e262c9008097fb2999ddb601eb519a7ae631f79ee20b9596bc3bf4c' 
  AND token = 'Gd+WM5R4Yz9AilyPfBjp+rYr7pjildms6s7JGHOdQqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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