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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97ccffdbbe4e4c544c478112bd8052b3b6ce64dac1742813548de2f7866b3ca' 
  AND token = 'QWgHKnBphlj3AKdAyRD5EfJZ28QE60ImRZwABNhB4mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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