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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f011770cd2de00cdb400f51742ba499b512f1c070541b7d5f2f91df01cb5e0f' 
  AND token = '6CEBzXJQi78Cr+m/uM2UpgpB68h9qGX2XD17hl6sXws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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