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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97b2a57a5a9e27b457e141c90da900f0a897b4db48d542ebcd6d8600fd96187' 
  AND token = '6R0lNg/DU3lSLphvdAP06FldCKSPXy+7H2wiJrq+4+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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