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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c924cc6a2aa161aaeff37e396f19b6129824aee27991e6fe0a31c9d65040b836' 
  AND token = '5w7VAHDS8QYBgiKzE2Owwh36CMH6Wov8940rUbBzXww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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