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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0f3d55970a56114b81e5e975115fb2bcbae7067a4b0c85e5ccb849913b4f88' 
  AND token = 'RooXTZWon7AWnxq6T/rTaGB9uH2g/8T5r3DFrjydgF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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