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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266b1b903d4d30a103a154516f9af16e0b6285e3ad4faa0639b773c16f9bf6e8' 
  AND token = 'w6/NtrDQeY6G7S+E4dGQNf0bPqzahfzmoQi9iknFDEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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