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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99a8e85625e98596279c370a9662f4a54b4f56f61fa1a1ad7654d49aee85b33' 
  AND token = 'kysQ5nokw2K56C5uxtxOyu9e7rEq5IPO9ukj288c7m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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