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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5153beab8fcf803f0dc161d9bb204586c7e808ab309df4e8b03b76d7a4f9be' 
  AND token = '3W7tCYA1r4Tj0lh7dnGm7H5VVWqFOMKPpz/M1TIkWsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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