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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c5640f773c1fb14ff3ae141ffb13873cb2b9aa730acb1dbae0628ae8cce12e' 
  AND token = '8JCt1QRmsYCEtisRw/lQbLlMWcSmz1/SKMhBe/3+NVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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