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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4c5b8ef85b5dc112acd22aa23b6fc0c93a5290bba6c255bc68804b72a6a216' 
  AND token = 'hadKeroZxQmB+TOlp8SC2t1KI1nCY/CtfBlRJnXI28U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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