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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36957f7fc9367c9e743711cae875d750e8cfeddc8ebb2f42a5e363c55bb948b3' 
  AND token = 'Mvm8/asWZ1T0SPGdECNSmFZAESc6gkmYTKQqQ+xdNZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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