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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccba2db0c8414bf21ebc353994be3b4cbd6944488a56242a05ab2fc395d55f06' 
  AND token = 'CocNxZZpgA6TRDOIVBrISbC3VVIN/h14iuh8bvemWOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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