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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29178ae59ef866d88994e14242c1e9f23052f2f360a05e5758792087eb68b5e2' 
  AND token = 'cuLwf191b5g26KyVP2FntD5Y3vOEiPhGVzTQIj0Q96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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