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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9390e8cc46d890ef878a058585e581990f48bdd825c5567ce542d3e2a9360e00' 
  AND token = 'o+VyGXOysDg9GcOxJANh6KQR6Owx36MT2ZyjbAlSg9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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