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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d2e1c8ab056f6e34856807f24d92af1a2692ffa1106bf2b4b8cd5cd9d8b98d' 
  AND token = 'aVfvtT7QILZ07NUlNEvJ8Z6Jioif0ZulEOzN/YWRl5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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