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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ed521e34fb0e4ae38d633bf85d790754538964cfe1677783850ea9b8fb6799' 
  AND token = 'ptbsYI72HFSRqdIbS32Bm7Fq9tZp30uBToK0EeZs7fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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