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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9a580093897ee43da15d0f41a4fc71a8ee6ea02073ff3672b2d30b477cea7e' 
  AND token = '4CwM6I0fE3FW8Mu2KxlSUX9MNEwwnx00FJhCzPS9pN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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