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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd374483fe1b0aa7c5ad6d8e6403f219b98f891971e70f9276b8172dcf32ebf' 
  AND token = 'ceeIElLy2As3m/YB3ouTowQ6IEdd55wHstIdeicGFQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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