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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731f83ccaf021229bd3730b3ad6c62aa8d372f83655fb4f5179b17a33027dc62' 
  AND token = '/AnmjaAHwL/pImbv0G4MpM257fUp8dgUmqZHitVY6rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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