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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d7ecb22bb7b6ef0364fbbd9c15616c7dc0e1c6c822c59fd309591d06b4e8e9' 
  AND token = 'RwnHRYtzzLsW1VBBCc4Sb2dglumVDX+y5TaQuPxOgo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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