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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267ac2566a10aa2f1ff51eeeaa99d04d5d844d6ecef5c1a66cd5b68cf27f89ef' 
  AND token = '7hK+tq6t1H8AfSH2PUzPYbi7G+jXVyJhnF5DL77HPsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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