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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40edf4bb1d7a658bc38559e438c957c656af5d0cd57c2e594137ad698a6e4f48' 
  AND token = '26oTMkILMGpmrgzGrHhHKy0JdIY5HVgk4XJJyeP159s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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