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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c96437d8db5c56da955326dbb71fea355d5dbc11fd99e99a7071e0533c98c5b' 
  AND token = 'LJ5wUmFOh2hBgcuGcT6gihWzUSYEf5vofIiI5dTvQ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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