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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be68d93456d1e8135407764e6f9686858cddf654241223c496aa044e71255bcd' 
  AND token = 'jZ/m5i6+jm/YSgH4jsKPPIDgnM7iYGcWqjfxe8SSxFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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