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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b098e543b52d9681f0975ab541852c0e00fb412dc4e626d51392be949cce0fa2' 
  AND token = 'sDD9Lkm1E/RPTi2p7Dqtni8u508N9aaAI2WDGVElYrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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