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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bcc3d012951c005f0b3fb9eb48b8202c46c7c043f349d3750e301a754662ce' 
  AND token = 'PcfqoCXUc5yGR5on/2Ij61SArCw4U3Kjro1Y5HwBZms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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