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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f86bb04728cc127ba93cb20b19196ed7187129cced0295b9044d60a7f1b1c1' 
  AND token = 'Mn6wSWQeyulhWJEuiUzdiVDsTMJDYe7385OT10ABsVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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