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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fccd0cd57da95e6d0f1b395e9be100ba4e0f58daab19cc8c0fb2c3a96820890' 
  AND token = 'zavVnMfbSh/2PCGQMRL/W8VOkBlX3wTjLKBMILEjXnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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