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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5ca91cfcfe7c95b2662a8c040fd73936607be9709d55e8059172bc30af37d8' 
  AND token = 'QzE8SEGRiQjQgk4vzrW52+b+90peUzfWpEZ4ceSLFgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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